JPH0312891Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a formwork with movable flanges used when pouring filler concrete between concrete girders of a bridge.

[Prior art]

Conventionally, when pouring filler concrete between concrete girders, as shown in FIG. It is placed on the upper surface of the lower flange 9 of the adjacent concrete girder 8, and filler concrete 10 is placed on top of the iron channel formwork 6.

[Problem that the invention attempts to solve]

However, in the case of the channel formwork 6, when the upper surface of the lower flange 9 in the concrete girder 8 has an angular deviation or twist due to manufacturing error, a part of the upper surface of the lower flange 9 and the channel form 6 A gap is created between the concrete and a part of the inclined flange 7, and there is a possibility that concrete may leak from the gap. Furthermore, in areas subject to salt damage, there is a problem in that iron channel formwork corrodes early and has an adverse effect on filler concrete.

[Purpose of the invention, structure]

The purpose of this invention is to provide a formwork with movable flanges for concrete pouring that can advantageously solve the above-mentioned problems. Synthetic resin connecting rods 2 with circular cross sections extending along the edges of the resin form body 1 are integrally connected to both sides of the resin form body 1 in the width direction, and the synthetic resin form 3 is formed. A synthetic resin inclined flange 4 extending along the upper surface of the lower flange of the concrete girder has a connecting groove 5 with a partially cut-out circular cross section that is partially open on the upper side and extends in the longitudinal direction of the flange material. With a movable flange for pouring concrete between concrete girders, the connecting groove 5 of the inclined flange 4 is rotatably fitted into each connecting rod 2 of the formwork 3. It is in the formwork.

〔Example〕

Next, this invention will be explained in detail using illustrated examples.

Figures 1 to 4 show a formwork with a movable flange for pouring filler concrete according to the first embodiment of this invention, which is a synthetic resin formwork with an arch-shaped cross section extending in the longitudinal direction of the girder. Synthetic resin connecting rods 2 extending along the edges of the form body 1 and having a diameter larger than the thickness of the form body 1 are integrally arranged on both sides of the body 1 in the width direction, A synthetic resin formwork 3 is constructed. In addition, a connecting groove 5 with a partially cut-out circular cross section is provided in the synthetic resin inclined flange material 4 extending along the upper surface of the lower flange of the concrete girder, the upper part of which is open and extending in the longitudinal direction of the flange material. Furthermore, a rising portion 11 is integrally connected to the upper end of the inclined flange 4, and the connecting grooves 5 in the inclined flange 4 are fitted into each connecting rod 2 in the formwork 3, so that the formwork 3 and the inclined It can rotate by a certain angle relative to the flange 4.

FIG. 5 shows the state in which the movable flanged formwork of the first embodiment is used. is placed, and filler concrete 10 is placed between adjacent concrete girders 8 above the movable flanged formwork.

The inclined flange 4 can rotate at a certain angle with respect to the formwork 3, and the formwork 3 and the inclined flange 4
Since the inclined flange 4 is made separately from the formwork 3, the inclined flange 4 can be twisted with a relatively small force against the formwork 3. Therefore, the upper surface of the lower flange 9 is free from deviations in inclination angle or twisting due to manufacturing errors. Even if there is a problem, the inclined flange 4 can be automatically rotated or twisted relative to the formwork 3 due to the weight of the filler concrete 10, so that the lower surface of the inclined flange 4 can be brought into close contact with the upper surface of the lower flange 9.

In the case of the first embodiment, since the form body 1 has an arched cross section, the strength against the weight of the filler concrete can be increased.

FIG. 6 shows a second embodiment of this invention, in which a groove-shaped portion 12 that opens upward is formed in the middle part of the form body 1 in the width direction. This is the same as in the first embodiment.

FIG. 7 shows a third embodiment of this invention, in which a large number of short inclined flanges 4 made of synthetic resin are attached to a connecting rod 2 made of synthetic resin in one long form frame 3 made of synthetic resin. The end portions of the synthetic resin inclined flanges 4 are joined to each other, but the other structure is the same as that of the first embodiment. In the case of the third embodiment, each of the short inclined flanges 4 can rotate independently, so even if the upper surface of the lower flange 9 is twisted, each inclined flange 4 can rotate independently.
can be brought into surface contact with the upper surface of the lower flange 9, and the formwork with movable flanges can be easily bent in the vertical direction, so even if the upper surface of the lower flange 9 is curved in the vertical direction, each inclined flange 4 can This makes it easier to make it come into close contact with the upper surface of the lower flange 9.

When implementing this invention, the rising portion 1
1 may be omitted.

[Effect of idea]

According to this invention, connecting rods 2 having a circular cross section and extending along the edges of the formwork body 1 are integrally installed on both sides in the width direction of the formwork body 1 extending in the longitudinal direction of the girder. , a formwork 3 is constructed, in which a connecting groove 5 with a partially notched circular cross section provided in an inclined flange 4 extending along the upper surface of a lower flange 9 of a concrete girder 8 is rotated by a connecting rod in the formwork 3. Since it is inserted freely, the inclined flange 4 can be rotated with respect to the formwork 3, and since the formwork 3 and the inclined flange 4 are made separately, the inclined flange 4 can be rotated relative to the formwork. Therefore, even if the upper surface of the lower flange 9 of the concrete girder 8 has an irregular tilt angle or is twisted due to manufacturing errors, the lower surface of the inclined flange 4 can be twisted relative to the upper surface of the lower flange 9. It is possible to prevent concrete from leaking from between the inclined flange 4 and the lower flange 9 by bringing the concrete into close contact with the formwork 3.
Since no bending moment is applied to the joint between the formwork 3 and the inclined flange 4 when a huge pressure is applied due to the weight of the concrete, the strength of the joint between the formwork 3 and the inclined flange 4 is high relative to the weight of the concrete.
Moreover, since the formwork 3 and the inclined flange 4 are made of synthetic resin, effects such as being able to eliminate the fear of adverse effects on concrete due to corrosion, which is a drawback of iron formworks, can be obtained.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment of this invention, in which Figure 1 is a longitudinal sectional front view of a formwork with movable flanges for pouring concrete, and Figure 2
The figure is a vertical side view thereof, FIG. 3 is a perspective view of the formwork, and FIG. 4 is a perspective view of the inclined flange. FIG. 5 is a longitudinal sectional front view showing the state of use of the movable flanged formwork for pouring concrete of the first embodiment.
FIG. 6 is a longitudinal sectional front view showing a movable flanged formwork for pouring filler concrete according to the second embodiment of the invention, and FIG. 7 is a movable formwork for pouring filler concrete according to the third embodiment of the present invention. It is a side view which shows a part of flanged formwork. FIG. 8 is a longitudinal sectional front view showing the state of use of a conventional formwork for pouring compaction concrete. In the figure, 1 is a synthetic resin formwork body, 2 is a synthetic resin connecting rod, 3 is a synthetic resin formwork, 4 is a synthetic resin inclined flange, 5 is a connecting groove, 8 is a concrete girder, and 9 is a lower flange. , 10 is filler concrete.

Claims (1)

[Scope of utility model registration request] On both sides in the width direction of a synthetic resin form body 1 extending in the longitudinal direction of the girder, synthetic resin connecting rods 2 with a circular cross section extending along the edge of the form body 1 are integrally installed, A synthetic resin formwork 3 is constructed, and a synthetic resin inclined flange 4 extends along the upper surface of the lower flange of the concrete girder.
A connecting groove 5 having a partially cut-out circular cross section is provided, the upper part of which is partially open and extending in the longitudinal direction of the flange material. A formwork with a movable flange for pouring concrete between concrete girders, characterized by being rotatably inserted into the formwork.